Adjustable chair



May 14, 1929. T. M. DENSON ET AL 1,713,034

ADJUSTABLE GI-IAIR Filed Oct. 24, 1927 unaway-'4 m Attorney Thomas MBenson wgg g Patented May 14, 19959 i l l ,1," u il t, W ilud Ellie ti ilt it little entice tlur invention relates to improwiinents inadjustable chairs which, while adapted tor various uses, areparticularly designed for use by operators of linotype machines.liocause ot the position (it the low keyhoard oi linotypo .i'nacliines,the maerator is reuuited to use a low chair that must he adjustable torhis cmiveuieuce and comfort. The chair of: our invention is prov dedwith a seat that is vertically adjustable, and also capable of beingtilted either to the .l' 'ont or to the rear, and the adjustable seat isprotitled with a back that also is capable oil? iuljustiuent withrelation to the seat. Our intention consists in certain novel Cll1l,)1nations and arrang 'enients of parts whereby the various adjustments maybe accomplished with facility and coutenieuce as will lei'einalter bemore fully pointed out and claintied.

liu the accompanying drawings we have illustrated. one comjilete exampleot the physical GHIlXMlllllOllt of our invention wherein the parts arecoinluned and arranged according; to the host mode we have thus tardevised for the practical application of the principles of ourinvention. The parts thus combined and arrailged comprise a minimumnumber of elements that may he assembled with facility to term thechair, the parts are durable and simple in construction, and theadjustments may be accotnplished by simple o ierations.

llhgure 1 is a front perspective View oi: a chair according to ourinvention.

Figure 2 is a side View of the chair.

inure 3 is a side view of the chair with the seat tilted backwardly: andthe back also tilted hacltwardly, at line (-23 F 1,91. 1..

li igiire l is a sectional detail View at line l l of Figure 2.

Figure 5 is an enlarged, sectional detail View showing the springlocking means for the adjustable seat. I

Figure 6 is a perspective View of a traginental portion of the rear ofthe seat showing method of adjusting; the seat and also the inclinationof the chair back.

In carrying out our invention the supporting frame of the chair ispreferably inade up of tubular legs as l, 2,3, and 4t that may befashioned 0i metal pipe sections and joined by rungs 5 to form a r1gidbase structure for the chair. The legs are of the same height and allprovided with teet as 6, and at their upper ends are joined by a pair oltubular side bars 7, 7, and a tubular front bar 8 and tubular rear bar9, the side, rear and trout bars oi? course being horizontal. Thehorizontal bars and the vertical legs are joined together by use of thecaps or castings 10 that have annular, threaded flanges in which thethreaded ends oi the hairs and legs are screwed, and these caps as shownare hollow and couuni'luicate with the interior of: the tubular legs andbars.

The seat 55 is vertically adjustable with relation to the hase or frameoi the chair, and the adjusting parts are unhoolced through a pull. oneither of the chains 11 or 1:2, the toriner at the front and the latterat the rear of the chair. The seat S issupported above the base or frameby means of tour posts 13, 14-, 15 and 16 that telescope in the fourtulu'ilar legs, through the hollow caps or heads 10, and each 031 theseposts is fashioned with a series of transverse bolt h0les17 tor theaccounuodatiou of bolts l8.

There are four of these spring bolts 18, two in the front bar and two inthe rear bar, at the ends of the bars, and the belts are designed toproject through the bolt holes 17, in the posts, and through the boltholes 19 in the outer walls of the caps, as best seen in Figure 5. Eachholt has a slide head, as 20 that is reciprocahle in its tubulat bar, asS or 9, and a spring 21 is enclosed within the tubular bar andinterposed between the adjoining inner ends oil" the slide heads 20 ofeach tubular bar to normally spread the bolts and force them into thebolt holes 17 of the posts and holes 19 of the caps to lock the posts inthe legs, and. thus lock the seat 8 in adjusted position.

The bolt-releasing chains 11 and 12 are connected at their ends toscrews as 22 that are passed through longitudinal slots 23 in theundersides of the front and rear bars and located near the ends of thesebars, and it will. be apparent that a pull on the chain will withdrawthe bolts from the caps and posts against the tension of the spring 21to release the posts for adjustment. After the scat S and its posts havebeen adjusted, the chains are released and the bolts are projected intolocking position.

The posts that telescope into the tubular, vertical legs are eachfashioned with forks 2 1 that are pivoted or hinged at 25 at the frontof the chair seat, while the two rear posts have pivot pins 26 thatco-aet with slots 27 at the rear sides of the chair seat S to providefor angular adjustment of the seat S.

Thus it will be apparent that the seat S may, while in horizontalposition be vertically adjusted with relation to the chair base orframe, and the seat may be tilted rearwardly as in Figure 3 orforwardly, if desired, by manipulation of the four spring bolts, v

The seat-back B may also be locked in ya rious positions relative to theseat, as indicated in FiguresQ and 3, and the locked back is releasedfor adjustment by pull on a chain 28 that releases bolts 29 carried inthe tubular bar 30 the locking and unlock ing action being the same asfor the bolts 18. The tubular bar 30 is supported near the rear of andunder the seat-back in brackets 31 and the bolts are projected throughbolt ed to the seat S at 37 and to the seat bars at 38 to provide forthe adjustment and rctention of the seat-back after the latter has beenadjusted.

By manipulation of the three chains the locking devices may be released,and it will be apparent that the adjustable partsmay with facility bemanipulated to the desired positions, after which. the parts are lockedby release of the chain or chains.

Having thus fully described our invention what we claim as newand desireto secure by Letters Patent is The combination with a chair frame including a pair of tubular legs, hollow caps thereon and a slottedtubular cross bar connecting the caps, of: posts telescoping said legsand provided with bolt holes adapted to aline with similar holes in thecaps, a pair of belts in the cross bar adapted to engage the holes ofthe caps and posts, a spring within the cross bar interposed between thebolts, screws secured in the bolts and guided in the slotted cross bar,and a flexible releasing-connection between said screws exterior of thecross bar.

In testimony whereof we allix our sigma tures.

CHARLES F. WILLSIE. THOMAS M. DENSUN.

